调试信息： SELECT id,category FROM {course} WHERE id IS NULL
[array (
)]
Error code: invalidrecord × ‎关闭此通知‎

堆栈跟踪：

• line 1662 of /lib/dml/moodle_database.php: dml_missing_record_exception thrown
• line 1638 of /lib/dml/moodle_database.php: call to moodle_database->get_record_select()
• line 200 of /lib/classes/context/course.php: call to moodle_database->get_record()
• line 324 of /local/coursecomplex/lib.php: call to core\context\course::instance()
• line 132 of /local/coursecomplex/singleproduct.php: call to lcc_get_product_image()

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